[Asterisk-Users] newbie ISDN question

[FastJack]

hi everybody, sorry for posting such a stupid question ;)

i've managed to run asterisk* with my AVM fritz2.0 card and a some
VOIP-softphones (SIP, H323). the functions of asterisk* really satisfied me
;)))

now i want to run asterisk* istead of our old PBX. but it would be great to
connect some phones directly to my box. how does a E100P from digium work.
can i connect it to my ISDN-line and my internal phones (ISDN)?

it would look like this:

                [PHONE2]
                 /
[PC]-[E100P]  - [PHONE1]
                 \
                 [ISDN-LINE]

thank you for your help!!!
thorsten